31668340 has 24 divisors (see below), whose sum is σ = 72549792. Its totient is φ = 11515680.

The previous prime is 31668281. The next prime is 31668347. The reversal of 31668340 is 4386613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31668347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71754 + ... + 72193.

It is an arithmetic number, because the mean of its divisors is an integer number (3022908).

Almost surely, 2^31668340 is an apocalyptic number.

It is an amenable number.

31668340 is an abundant number, since it is smaller than the sum of its proper divisors (40881452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31668340 is a wasteful number, since it uses less digits than its factorization.

31668340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143967 (or 143965 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 31668340 is about 5627.4630163156. The cubic root of 31668340 is about 316.3795711255.

It can be divided in two parts, 31668 and 340, that multiplied together give a triangular number (10767120 = T₄₆₄₀).

The spelling of 31668340 in words is "thirty-one million, six hundred sixty-eight thousand, three hundred forty".